No Of Consonants In A String

/* WAP to print the number of consonants in a string.  */
import java.io.*;
class StringQ03
{
public static void main(String arg[])throws IOException
{
 int i, l, cons;
 String str;
 char ch;

 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    System.out.println("Enter a string : ");
    str=br.readLine();
    l = str.length();

    // To count no of vowels
    cons = 0; 
    for(i=0;i < l;i++){
        ch = str.charAt(i);

        //First check if the character is a letter
        if((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')){
            //Now check if it's not a vowel i.e. character is a consonant
            if(ch != 'a' && ch != 'e' && ch != 'i' && ch != 'o' && ch != 'u' && 
                ch != 'A' && ch != 'E' && ch != 'I' && ch != 'O' && ch != 'U')
            cons++;
        }
    }
    System.out.println("No of Consonants: "+cons);

}//end of main
}//end of class